1317881 has 2 divisors, whose sum is σ = 1317882. Its totient is φ = 1317880.

The previous prime is 1317853. The next prime is 1317887. The reversal of 1317881 is 1887131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 434281 = 940^2 + 659^2 .

It is an emirp because it is prime and its reverse (1887131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1317881 - 2⁶ = 1317817 is a prime.

It is a super-2 number, since 2×1317881² = 3473620660322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1317887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658940 + 658941.

It is an arithmetic number, because the mean of its divisors is an integer number (658941).

2^1317881 is an apocalyptic number.

It is an amenable number.

1317881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317881 is an equidigital number, since it uses as much as digits as its factorization.

1317881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 1317881 is about 1147.9899825347. The cubic root of 1317881 is about 109.6374011004.

The spelling of 1317881 in words is "one million, three hundred seventeen thousand, eight hundred eighty-one".